Electric-bell mechanism.



G. B. WURSTR.

ELECTRIC BELL MECHANSM.

APPLIUA'HON Hmm APH. 1012 1,05453'79. Patented Feb. 25, 1913.

the same as thc angular. movement o'lE the GEORGE B. WURSTER, OF NEWYORK, N. Y.

. ASSIGNOR TO YV. R. OSTRANIJRR & COM- ELECTRICJEELL MECHANISM.

Specification of Letters Patent.

Paten ted lfeh. 25, 1913.

Application tiled April 26, 1912, Serial No. 693.321.

To all 'zc/0m it may concer/L le it known that l. Gunner: il. V/Uus'ruu.acitizen ot the United States. and resident oi New York, in the, countyot' iestchcster and State ot' New York. have invented certain new anduseful mproren'lents in Electric-liell Mechanism, otl which thefollowingY is a spel iiication.

lily invention relates particularly to what are comnumly termed singlestroke signal or alarnl goings. l

The ohjiect'- is to provide a construction Ywhich will give a powrn'tulstroke and res quire only a minimum consumption of current.

YBriefly ccnsiderrul the invention contemplates the use of aneleetronnagnet, a pivoted armature and a striker pivoted to thearinature so that a small movement ot' the a rmatnre is nmltiplied inthe movement ot the striker. To facilitate this movement the striker isin the form of a` lever, the short; end ot which hasI a roller whichtravelsI on a guide plate. A yielding stop is provided .tor the armatureand this I stop may he adjusted to vary the action ot the striker.

Figure l is a front view ol mechanisui embodying the Aimprovements ot myinvention showing),r in dotted lines the position ot' the armature andstriker in the act ot stri k ing. Fig. 2, is a` side view otl thearmature and striker.' Fig. 3, is a side view ot' a modification 'oitthe armature and striker. Fig. 4t, is a front view ot the constructionof Fig'. 3.

The base or frame l is ot suitable con- .--:truction adapted to hesecured to a support in any suitable manner asl is customary in devicesof this character. lhe hell or gong 2 is secured to the trame in anysuitahlo manner.

The electro-magnets f5 are ot' suitahle isnal construction supported hythe t'rame il. The armature t is pivoted at 5 and is adapt- .0d to beattracted hy the electro-magnet. A. contact screw t3 may. he adjusted tovary the relative initial position ot the armature. .lhe electricalconnection .may he made iii any suitl .fle manner as is customary inthis art.

Ordinarily the striker is a part oi or formed as a prolongation ol thearl'nature so that the angular movement olE the striker is armature. l'thas also heen proposed to pivot the striker independently oi' thearmature and connectl it to the armature hy some form. ot link. ',lhistype ot mechanism introduces.

additional friction and lost movement as well as cou'lplications inconstruction. By my invention the striker 7 is pivoted :it-8 to theupper end ot the armature t and the lower end o't the striker isprovided with a roller 5l which hears against the track plate l() on thehead ot' the electromagnet. The striker is therefore a lever whose shortarm carries the roller 9 and whose long arm carries the hammer 11.

When a magnet is energized the armature 4 is drawn suddenly toward itthus drawing.;I the pivot S to the left. as viewed 'in Fig. 1. Thiscauses the, striker to turn on its pivot S, the roller 9 traveling avery short distance down the track plate l0. This throws the outer endot the striker and hammer l1 toward the gono". lt is possible in thisway hy only a slight movement of the armature l to ohtain a wide swingofthe striker. This is o'tl particular advantage when it is realizedthat the operation ot a magnet is most etlicient when the armature isnearest to it; and that it requires an exceedingly powerful magnet` andthe consun'iption ot` a large amount ot current to start the armaturewhich is initially located aty a considerable distance 'from its magnet.I also provide a yielding' stop 'l2 tor instance ot' rubber, felt orother yielding material tor the striker as the striker rebounds from thegong. This stop is carried hy an arm t3 which extends through the post14 and is clamped hy a screw l5. In this way the arm may be adjusted soas to vary the position of the slop and action ot' the striker. ,Toprevent the striker from getting out.. 'of place relative to thearmature a har 17 ymay he provided as shown in l5`igs. 1 and 2.

Itis preterahle to so locate the magnet, armature, striker and gong,rthat when the armature is drawn over against the magnet, the har '17will act as lstop't'or the lower end o't the striker hut the momentum ofthe hammer end ot the ,striker will carry the hammer against the gong.The armature and striker are then' substantially in a straight lineandact. as" if in. one piece so that; thc hlow will he resonant. 4thenthe hlow is struck the hammer springs away from the gong slightly eventhough the magnet continues to be energized and con- .einues to hold thearmature against it.

By the construction'thus shown and described vwith the frame 11p-rightas shown in Fig. 1 it is unnecessary to' use any spring in connectionwith the striker or the armature. This vhas a particular advantage inthat the springs which are customary to use for the purpose ofretractingthe armature and striker necessitate power in the imap;- nets toover-come the springs in the strik-- ing action. By my construction thearmature and striker will rebound and-remain retracted Without the useofsprings. It at any time it should be necessary to install thisconstruction in a position'such that the vparts would not normallyremain in their proper lretracted position it is obvious that a ,springor springs mightbe employed in the manner common inthis art.

" In the form shown in. Figs. l and 2 the end of the armaturev is forkedto receive the end of the. striker. ln Figs. 3V and 4C the end-of thestriker is forked to receive the end of the armature and two rollers 18and le' are providedin place of the single roller 9. It willbe obviousthat other modiiications may be made Without departing fromthe spirit orscope of my invention.

1. In :in elect-ric bellv mechanism, an elec tromagnet, lan armature, astriker pivotally carried by the armature, a track plate and a rollercarried by the strikerand engagingr the tra-ck plate.

2. In an electric bell construction, an electromagnet, a pivotedarmature therefor, a striker pivoted intermediate its ends tothearmature, a track plate at the head of the ,are

magnet, the inner end ot the striker engaging said track plate and astop tor said lstriker.

3. n an electric bell construction', an electro-magnet, an armaturetherefor, a striker pivoted intermediate its ends to said armament andof the gong `for limitingl the stroke of the striker in advance of thearmature;

4. ln an electric bell construct-ion, a inagnet, an armature, a strikerpivotcd interina diate its ends to the armature, a stop can ried by oneof`said last named tvvoeleinents and engaging the other for checking thestriker and an abutment for the inner end of said striker, said strikerbeing adapted to be brought into line with said armature at the strikingposition.

5. ln an electric bell construction, a magnet, an armature, a strikerpivoted intermediate its ends to said armature', an abutment for theinner end of'said'striker between said armature and said magnet and aroller interposed between said abutment and said striker during theentire ringing stroke. t

6r In an electric bell construction, a inagnet, an armature therefor, astriker pivoted intermediate its ends to the armature, an abutment forthe inner end of said striker, a post, an adjusting screw for thearmature carried'by said post and an adjustable stop for the strikercarried by said post.

GEORGE B. Wil/BEER?.

litnesses:

R. S. ALLYN. E. BnAnFom

